I have two GP-8's and FC-100's, and I do have one EV-5, too. Last time I actually used it was on a synth for recording Narcotic, I think. It's nice for those odd moments when I go Kirk Hammett in my mind and realize that I can't operate a wah pedal and play to save my life, haha. I used to be able to do a pretty good wah on the intro to Voodoo Chile, but that's about it. Anyhow, I digress...
I can't recall discussing it, but we may have. If presets are going wonky (garbled names, parameters messed up after a powercycle) it's generally just the battery that needs replacing. I'd fix it for you free of charge, but shipping would be painful.